Original Soundproofing / Bulkhead Sound Insulation Mat for Interior – 4K1863947

Original factory lower sound-deadening mat and bulkhead insulation for the center tunnel from the passenger compartment side (interior acoustic and thermal insulation for the front bulkhead and windshield area – Stirnwanddämmung Innen / Dämmung Spritzwand Fahrgastraum), designed for Audi A7 Sportback, S7 and RS7 (4K / 4K8 generation), as well as Audi A6 C8 (type 4K2 / 4K5 / 4KA) produced from 2018 to 2026, including versions with 3.0 V6 TFSI (55 TFSI / 340 hp) and 2.0 TFSI (40/45 TFSI) petrol engines, S7 and RS7 variants, and TDI diesel engines with Mild Hybrid (MHEV 48V) systems, based on the modular longitudinal MLBevo platform.

Original VAG group interior thermal and acoustic insulation component. Made using layered pressed high-density polyurethane foam technology, combined with an outer coating of heavy synthetic elastomer and dense technical non-woven material that dampens resonances and bodywork vibrations. Precisely contoured to fit the bulkhead creases, pedal area, and the transition to the front section of the center tunnel. It features factory cutouts and openings for the steering column, pedal assembly, air conditioning condensation drains, and main cockpit wiring harnesses. It isolates the cabin from engine and gearbox noise and protects the interior from heat radiation from the engine compartment and exhaust system.

Technical specifications:

• Catalog part number (OE): 4K1863947 / 4K1 863 947 (and related revisions with letter suffixes 4K1863947A, 4K1863947B, 4K1863947C)

• System / Category: Interior components, soundproofing and acoustic comfort / Bulkhead mats, interior thermal and acoustic insulation (Interior Bulkhead Sound Absorber / Stirnwanddämmung)

• Function: Engine compartment and gearbox noise reduction, thermal insulation of the interior from the chassis

• Construction: Pressure-formed multi-layer mat with factory mounting creases

• Material: Vibration-dampening polyurethane foam + heavy layer (EPDM/composite non-woven material)

• Installation location: Passenger cabin – lower section of the bulkhead / connection to the center tunnel under the floor carpeting

• Dedicated model: Audi A7 Sportback / S7 / RS7 (type 4K8) and Audi A6 / Avant / Allroad (type 4K - C8)

• Steering side: Left (LHD – European / USA version)

• Condition: Original used part (100% functional – in very good condition, mat is dry, clean, not saturated with moisture or operating fluids, foam structure is resilient, no tears in critical passageway areas)

• Manufacturer: Audi AG / VAG (Original OEM)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years 2018 to 2026 (all TFSI and TDI engine versions in LHD)

  • S7 Sportback (type 4K8) – model years 2019 to 2026

  • RS7 Sportback (type 4K8) – model years 2019 to 2026

  • A6 / A6 Avant / Allroad (type 4K2 / 4K5 / 4KA - C8) – model years 2018 to 2026

  • S6 / RS6 Avant (type 4K - C8) – model years 2019 to 2026

Fitment guarantee and VIN verification

Each soundproofing mat undergoes a material cleanliness check, inspection for moisture, and assessment of the integrity of the factory openings before being prepared for shipping.

Fitment / installation note: The initial designation 4K1 (interior trim and soundproofing group 863 / 947) defines the component dedicated to the C8 / MLBevo platform in left-hand drive (LHD) configuration. The lower bulkhead soundproofing sections are damaged or compressed in the event of interior flooding (e.g., clogged windshield or sunroof drains) and during accident repairs involving the straightening of firewall and suspension tower panels. Saturated foam loses its sound-absorbing properties and can cause an unpleasant musty smell in the car. The offered mat is completely dry, flexible, and ready to be placed directly in the bodywork under the factory floor carpeting. Before purchase, we recommend comparing the OE number on the label or verifying it using the vehicle's VIN.